af05064f97
Move calculated type sets for unions into a map, rather than storing them on the Union type. Type sets for unions only matter during calculation of interface type sets, and to a lesser extent inside of Identical. The latter should not be encountered during type checking, as Identical uses the precomputed interface type set when comparing interfaces, and unions do not arise outside of interface types. Removing the tset field from Union potentially frees up memory, and eliminates a source of races via calls to NewUnion and Identical. It also sets the stage for recording Unions for every subexpression of union terms, which preserves an existing invariant that BinaryExprs and UnaryExprs should have a recorded type. Updates #50093 Change-Id: I5956fa59be6b0907c3a71faeba9fa5dd8aae0d65 Reviewed-on: https://go-review.googlesource.com/c/go/+/371756 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> |
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